| Year: | 1971 | 
|---|---|
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.27:8503 | 
| Series: | Information circular / United States. Bureau of Mines ; | 
| Report Number: | 8503 | 
| Subjects: | Mine dusts | 
| Mine safety | |
| Lungs--Dust diseases | |
| Mine safety--technical manuals | |
| Link: | https://hdl.handle.net/2027/mdp.39015078514703 |